I don't think that is a stupid question, a lot of people seem to want something that appears to be specifically designed for the car or car type. The Philips unit I bought is totally non-specific to VW family vehicles but the Connects2 cables looked after that.
I suppose there is the issue of the physical fitting being easier if the unit has the four screwhole lugs that directly fit the VW family but I had no issues with the normal Double Din cage inside the VW adaptor. Back to the Pumpkin units on Amazon, here is a slightly different design that to me looks a bit nicer which says
http://www.amazon.co.uk/Pumpkin-Capacitive-Multi-touch-Navigation-Multi-media/dp/B00RDRE8FG
I must admit that I would increasingly be inclined to take a gamble on the unknown factors here given the huge apps support of Android, I particularly like the OBD2 thing with Torque